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Finding the Fourth Proportional to 128,739.64, 193,109.58 and 73,219

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Solution

The fourth proportional to 128,739.64, 193,109.58 and 73,219 is: 109,828.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,739.64 : 193,109.58 = 73,219 : x
  2. Step 2: Convert to fraction form
    128,739.64/193,109.58 = 73,219/x
  3. Step 3: Cross multiply
    128,739.64x = 193,109.58 × 73,219
  4. Step 4: Simplify right side
    128,739.64x = 14,139,290,338.02
  5. Step 5: Solve for x
    x = 14,139,290,338.02/128,739.64
  6. Step 6: Final answer
    x = 109,828.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.